common: Drop log.h from common header

Move this header out of the common header.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/video/backlight_gpio.c b/drivers/video/backlight_gpio.c
index fb1525b..67fed7f 100644
--- a/drivers/video/backlight_gpio.c
+++ b/drivers/video/backlight_gpio.c
@@ -7,6 +7,7 @@
 #include <common.h>
 #include <dm.h>
 #include <backlight.h>
+#include <log.h>
 #include <asm/gpio.h>
 
 struct gpio_backlight_priv {